/*
 * Copyright 2014 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */

#ifndef SkBitmapCache_DEFINED
#define SkBitmapCache_DEFINED

#include "include/core/SkRect.h"
#include "include/private/base/SkAssert.h"

#include <cstdint>
#include <memory>

class SkBitmap;
class SkImage;
class SkImage_Base;
class SkMipmap;
class SkPixmap;
class SkResourceCache;
struct SkImageInfo;

uint64_t SkMakeResourceCacheSharedIDForBitmap(uint32_t bitmapGenID);

void SkNotifyBitmapGenIDIsStale(uint32_t bitmapGenID);

struct SkBitmapCacheDesc {
    uint32_t fImageID; // != 0
    SkIRect fSubset;   // always set to a valid rect (entire or subset)

    void validate() const
    {
        SkASSERT(fImageID);
        SkASSERT(fSubset.fLeft >= 0 && fSubset.fTop >= 0);
        SkASSERT(fSubset.width() > 0 && fSubset.height() > 0);
    }

    static SkBitmapCacheDesc Make(const SkImage *);
    static SkBitmapCacheDesc Make(uint32_t genID, const SkIRect &subset);
};

class SkBitmapCache {
public:
    /* *
     * Search based on the desc. If found, returns true and
     * result will be set to the matching bitmap with its pixels already locked.
     */
    static bool Find(const SkBitmapCacheDesc &, SkBitmap *result);

    class Rec;
    struct RecDeleter {
        void operator () (Rec *r)
        {
            PrivateDeleteRec(r);
        }
    };
    typedef std::unique_ptr<Rec, RecDeleter> RecPtr;

    static RecPtr Alloc(const SkBitmapCacheDesc &, const SkImageInfo &, SkPixmap *);
    static void Add(RecPtr, SkBitmap *);

private:
    static void PrivateDeleteRec(Rec *);
};

class SkMipmapCache {
public:
    static const SkMipmap *FindAndRef(const SkBitmapCacheDesc &, SkResourceCache *localCache = nullptr);
    static const SkMipmap *AddAndRef(const SkImage_Base *, SkResourceCache *localCache = nullptr);
};

#endif
